Piston



(No Model.)

S. P. WATT.

PISTOLT. N0.,442,'729. Patented Deo. 16, 1890.-

/52 #www MA Tin UNTTED STATES PATENT Ormea.

SERN P. NVATT, OF COLUMBUS, OHIO, ASSIGNOR TO THE COLUMBUS MACHINE COMPANY, OF SAME PLACE.

PISTON.

SPECIFICATION forming part of Letters Patent No. 442,729, dated December 16, 1890.

r Application iiled July 5, 1890. Serial No. 357,803. (No model.)

To all whom, it may concern:

cylinder; and it consists in the construction and novel arrangement of parts, as hereinafter more fully described, illustrated in the accompanying drawings, and pointed out in the appended claims.

The objects of my invention are, first, to provide the piston-springs with suitable rods passing through openings in a vertical iiange of the piston, said rods radiating from an annular' iiange within the piston-head; secondly, to provide said rods at their outer ends with sleeves adapted to bear against the piston springs against the tension of spiral springs on the rods, as hereinafter more fully described, and, thirdly, to provide suitable means for adjusting the piston-springs without necessitating the removal ot the followerplate.

In the drawings, Figure l is a perspective view of a piston-head embodying my improvements, the follower-plate thereof removed. Fig. 2 is a vertical section ot a piston, the follower-plate in position. Fig. 3 is a partial plan and sectional view of a piston-head embodying my improvements.

Referring to the accompanying drawings, in which like letters of reference indicate corresponding parts in all the iigures, the letter A indicates the piston-head, consisting of the horizontal plate A', having rising from it and at right angles thereto the vertical annular ilange A2, provided near its central part in its periphery and for its entire circumference with a series of openings a, for a purpose presently explained.

The letter B designates the piston-rod, provided with a shoulder l), upon which is def in the rods, piston-springs f of ordinary signed to rest the piston-head A, as shown in Fig. 2. Rising from the piston-head at its central part, and made integral therewith, is a hollow boss C, having intermediate of its upper and lower edges an annular shoulder c, designed to receive a iianged collar D, said collar being provided at its lower edge with a laterally-extending annular iiange d, having formed therein at regular intervals open-l ings d. At the upper edge of the collar D is formed a laterally-extending annular flange d4, provided on its upper face with an annular rectangular groove (Z2, said groove being provided in its outer wall with gear-teeth E, as shown in Fig. l.

F designates rods having one of their ends project-ing through the openings d, and have secured upon their outer ends, by means of split-keys passing through suitable openings construction. At their inner ends the rods F are bent at right angles, and said bent portion passed downward through the openings d and secured therein by pins passing through the projecting ends ot the rods'.

Upon the outer ends of the rods F are placed sleeves F', which abut'against the inner face of the piston-springs and are'provided at one end with an annular iiange F2, forminga support for one end of the coiled springs Gr, their opposite ends abutting against collars g on the rods F, and made adjustable thereon by set-screws g', which pass through suitable openings in the collars and have a point of bearing upon the rods F.

H designates a hollow boss made integral with the piston-follower plate, through which passes the reduced end of the piston-rod, and at each side thereof, as shown, the boss I-I is provided with vertical openings 72, 7L', in which tit and work shafts I and I', the former one having rigidly secured at its lower end and meshing with the gear E a pinion i, the upper end of said shaft having the squared portion 2, upon which fits a suitable wrench foi' 95 a purpose presently explained. The shaft I has rigidly secured at its lower end a pawl j, which is adapted to engage the gear E and hold the flanged collar l) in its adjusted position against the tension of G and f.

IOO

In order that the piston-head and pisto`11 follower may be strengthened, I form on their inner faces and radiating from the bosses C and I-I ribs K, as shown, and to firmly secure the follower' on the piston-head I form in the vertical iiange A2, at its upper edge, a series of screw-threaded lugs registering with openings formed in the follower-plate, through which pass the follower-bolts L.

It will be noticed in the drawings that t-he rods F do not radiate from the axial center of the piston, but at an angle thereto, the object being to make the rodsFsufticiently long to allow of the piston-springs being Vset out against the piston-ring, and to prevent binding of. the-sleeves F in the openings a the edges of' said openings are rounded off', as shown in Fig. 3.

The operation of my invention, taken in connection with the above description and accompanying drawings, may be briefly described as follows: When it is desired to adjust the piston-springs, should the piston at any time leak or the piston-ring bear too tightly against the cylinder, suitable wrenches are placed upon the upper squared ends of the shafts I and I', and by turning the wrench on the shaft I release the pawl from engagement with the. gear E. Then by turning the shaft I, carrying the pinion meshing with the gear E, the pistonsprings may be adjusted in or out as desired. W hen sufficient tension has been put on the piston-springs, the pawl is then turned to engage the gear E, as shown in Figs. 1 and 3. It will thus be seen that by my improvement piston-springs may be readily adjusted without necessitating the removal of the follower-plate, and that owing to the like pivoted connection of each spring with the flanged collar D, carrying the gear E, all the springs may be readily 'adj usted alike and cause the pistonarin g to bear equally at all points on the cylinder.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is-

1. The combination, wit-l1 the piston, of a hollow boss located therein, carrying a fian ged `collar having a series of rods radiating therefrom, the sleeves on said rods adapted to bear against the piston-springs through the me dium of coil-springs carried by the rods and bearing against collars on said rods, for the purpose set forth.

2. 'lhe combination, with thepiston having flange A2 and hollow boss C, with shoulder C, ofthe collar I), formed at its bottom with flange d, from which radiate the rods F, and at its top with flange d4, having formed therein the gear-teeth E, vertical key-headed shaft I, bearing pinion t', and key-headed shaft I', with pawl j, substantially as described, for the purposes specified.

3. The combination, with the piston provided with a vertical flange, of a hollow boss located Within the piston, carrying a fianged collar having radiating from it a series of rods carrying sleeves, which sleeves are adapted to bear against the piston-springs by coiled springs on said rods, and means, sub

stantially as described, for locking the rods in a projected position, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

SERN P. WA'VI.

W itnesses:

RoBT. B. COLLIER, R. \V. WEAVER. 

